#include "p24Fxxxx.h"

// using 24FJ256GB110 device
_CONFIG1( JTAGEN_OFF & GCP_OFF & GWRP_OFF & COE_OFF & FWDTEN_OFF & ICS_PGx2 )
_CONFIG2(     FCKSM_CSDCMD
            & OSCIOFNC_OFF
            & POSCMOD_HS     // Кварц 8MHz
            & FNOSC_PRIPLL     // primary+pll в дальнейшем потребуется для USB
            & DISUVREG_OFF     // не надо питать юсб-девайсы
            & PLL_96MHZ_ON
            & IOL1WAY_ON)

#define maxtime 20000

void init_migat(void)
{
        TRISA = 0b1100000000000000; // 1 - input
        T1CON = 0b1000000000110000;
        TRISD = 0b0000001100000000;  // 0 - output
}

unsigned int  migat_diodom(unsigned int  DELAY)
{
        if (DELAY == 0 || DELAY > maxtime) DELAY=3000;
            char i; unsigned int N = (unsigned int)(maxtime/DELAY);
            for (i = 1; i < N; i++)
            {
                TMR1 =  0;
                PORTDbits.RD0 = !PORTDbits.RD0;
                while (TMR1 < DELAY){}
            }
        return(DELAY);
}

void initAdc1(void)
{
AD1PCFG = 0x0000; // Configure A/D port
// Чтоб не промахнуться, ног (пока) много - 100 штук
AD1CON1 = 0x2002; // Configure sample clock source 0010 0000 0000 0010
// and conversion trigger mode.
// Unsigned Integer (FORM<1:0>=00),
// Manual conversion trigger (SSRC<2:0>=000),
// Manual start of sampling (ASAM=0),
// No operation in Idle mode (ADSIDL=1),
// S/H in Sample (SAMP = 1)

AD1CON2 = 0; // Configure A/D voltage reference
// and buffer fill modes.
// Vr+ and Vr- from AVdd and AVss (VCFG<2:0>=000),
// Inputs are not scanned,
// Interrupt after every sample
AD1CON3 = 0x0100; // Configure sample time = 1Tad,
// A/D conversion clock as Tcy

// Выбираем, какая нога будет входом АЦП:
                                    // Connect AN? as positive input 0000xxxx0000xxxx
AD1CHS = 0b0000000000000000;        // где xxxx - номер входа

AD1CSSL = 0; // No inputs are scanned.

IFS0bits.AD1IF = 0; // Clear A/D conversion interrupt.

IEC0bits.AD1IE = 1; // Enable A/D conversion interrupt
AD1CON1bits.ADON = 1; // Turn on A/D
AD1CON1bits.SAMP = 1; // Start sampling the input

migat_diodom(50);
AD1CON1bits.SAMP = 0; // End A/D sampling and start conversion
}

static unsigned int result;
void __attribute__((interrupt, no_auto_psv)) _ADC1Interrupt(void)
{
result = (unsigned int)ADC1BUF0;
IFS0bits.AD1IF = 0;

AD1CON1bits.SAMP = 1; // start sampling...
migat_diodom(result); // в качестве паузы мигаем диодом с периодом = result
AD1CON1bits.SAMP = 0; // start converting
}

int main (void)
{
    init_migat();
    RCONbits.SWDTEN = 0;// Disable Watch Dog Timer
       initAdc1();        // Init the A/D converter
    while (1);    
    return 0;
}